LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

365 loweb. chetaceous deposits in california and oregon
PLATE 57.—CRETACEOUS FOSSIL PROM CALIFORNIA
Shasticriocera* poniente nov, (1) Holotype. Greatest diameter, 225 mm,;
thickness of whorl, 45 mm. (2) Fragment of small example, showing character of
ribbing. Greatest diameter, 34 mm.; thickness of whorl, 13 mm. (3) Paratype,
Fragment of straightened arm, much reduced in size. Total length, 206 mm.; thickness
of arm (including ribs), 60 mm. All from Mitchell zone, lower part of Honetown
Group; Loc, 1657 (C. A. S.), Mitchell Creek, Shasta County, p. 204,